Some lions mate over 50 times a day.
61
Most tropical marine fish could survive in a tank filled with human blood.
54
Cows can sleep standing up, but they can only dream lying down.
745
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Crocodile babies don't have sex chromosomes; the temperature at which the egg develops determines gender.
45
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
Elephants, lions, and camels roamed Alaska 12,000 years ago.
32